Update fly.toml, .woodpecker.yml, and Dockerfile for deployment improvements

- Increased health check grace period in `fly.toml` to 30s.
- Added `dist` directory to cache mounts in `.woodpecker.yml`.
- Fixed file copy path in `Dockerfile` for accurate builds.

Dockerfile

@@ -5,7 +5,7 @@ WORKDIR /app
 COPY package*.json ./
 RUN npm ci
 
-COPY ../backup/backup .
+COPY . .
 
 RUN npm run build